package com.can.PC;

//生产者和消费者问题

//线程之间的通信问题：生产者和消费者问题！等待唤醒，通知唤醒
//线程交替执行 A线程，B线程操作同一个变量，  num=0
//A  num+1
//B  num-1
public class A_Synchronized版 {
    public static void main(String[] args) {
        Data data = new Data();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"B").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"C").start();
    }
}

//等待，业务，通知
//数字，资源类
class Data{
    private int number = 0;
    //+1
    public synchronized void increment() throws InterruptedException {
        while(number!=0){
            //等待
            this.wait();
        }
        number++;
        System.out.println(Thread.currentThread().getName()+"==>"+number);
        //通知其他线程，我+1完毕了
        this.notifyAll();
    }
    //-1
    public synchronized void decrement() throws InterruptedException {
        while(number==0){
            //等待
            this.wait();
        }
        number--;
        System.out.println(Thread.currentThread().getName()+"==>"+number);
        //通知其他线程，我-1完毕了
        this.notifyAll();
    }
}
